It looks like Pogo has run out of the Super Secret Badges that one earns when they complete a Mix & Match Album. I received this message from Pogo_Spike tonight:

Dear Club Pogo Member -

As one of our most favorite players, we want to thank you for all of the time you spend with us playing at Pogo. Pogo is a fun place to play because of awesome members like you!

It also looks like you’re getting ready to complete your 74th Mix-N-Match Album – wow! Congratulations on this huge milestone. As a result, you’ll be getting a Super Secret Badge, but it’ll be just a little delayed – sorry about that. We promise you’ll have it soon, and we’ll be sure to keep you posted. If you’re super speedy, this might impact your 75th Mix-N-Match Album, too … but never fear! We’re whipping up a bunch more Super Secret Badges and they’ll be awarded to your account in no time.

I got the same message! I think Pogo_Spike is their Front Guy to calm people down, so that they don't get so much nasty mail. I'm sure the "problem" will be fixed soon, even if it's just Pogo soon. I wonder what their new theme will be.